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STM8S003F3 Datasheet(PDF) 97 Page - STMicroelectronics |
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STM8S003F3 Datasheet(HTML) 97 Page - STMicroelectronics |
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97 / 104 page  DocID018576 Rev 9 97/104 STM8S003F3 STM8S003K3 Package information 98 10.4 Thermal characteristics The maximum chip junction temperature (TJmax) must never exceed the values given in Table 19: General operating conditions. The maximum chip-junction temperature, TJmax, in degrees Celsius, may be calculated using the following equation: TJmax = TAmax + (PDmax x ΘJA) Where: • TAmax is the maximum ambient temperature in ° C •ΘJA is the package junction-to-ambient thermal resistance in ° C/W • PDmax is the sum of PINTmax and PI/Omax (PDmax = PINTmax + PI/Omax) • PINTmax is the product of IDD and VDD, expressed in Watts. This is the maximum chip internal power. • PI/Omax represents the maximum power dissipation on output pins, where: PI/Omax = Σ (VOL*IOL) + Σ((VDD-VOH)*IOH), and taking account of the actual VOL/IOL and VOH/IOH of the I/Os at low and high level in the application. 10.4.1 Reference document JESD51-2 integrated circuits thermal test method environment conditions - natural convection (still air). Available from www.jedec.org. Table 55. Thermal characteristics(1) 1. Thermal resistances are based on JEDEC JESD51-2 with 4-layer PCB in a natural convection environment. Symbol Parameter Value Unit ΘJA Thermal resistance junction-ambient LQFP 32 - 7 x 7 mm 60 °C/W Thermal resistance junction-ambient TSSOP20 - 4.4 mm 84 Thermal resistance junction-ambient UFQFPN20 -3 x 3 mm 90 |
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